﻿#region License
// Copyright (c) 2005-2012, CellAO Team
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
// 
//     * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
//     * Neither the name of the CellAO Team nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion

namespace LoginEngine.Packets
{
    using System;

    /// <summary>
    /// The salt authentication.
    /// </summary>
    public class SaltAuthentication
    {
        /// <summary>
        /// Send packet with ServerSalt
        /// </summary>
        /// <param name="client">
        /// Client to send packet to
        /// </param>
        /// <returns>
        /// The send packet.
        /// </returns>
        public string SendPacket(Client client)
        {
            byte[] packet = new byte[]
                {
                    0xDF, 0xDF, 0x00, 0x01, 0x00, 0x01, 0x00, 0x34, // Total Length of Packet 
                    0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x2B, 0x3F, 0x00, 0x00, 0x00, 0x24,
 
                    // Packet Type (SaltAuthentication)
                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Server Salt (32 Bytes)
                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
                };

            byte[] salt = new byte[0x20];
            Random rand = new Random();

            rand.NextBytes(salt);

            string serverSalt = string.Empty;

            for (int i = 0; i < 32; i++)
            {
                // 0x00 Breaks Things
                if (salt[i] == 0)
                {
                    salt[i] = 42; // So we change it to something nicer
                }

                packet[20 + i] = salt[i];

                serverSalt += string.Format("{0:x2}", salt[i]);
            }

            client.Send(packet);
            return serverSalt;
        }
    }
}